In the following equation, identify Arrhenius acids or bases and Bronsted-Lowry acids or bases. NH3 + H2O --> NH4 +1 + OH-1
There are no Arrhenius acids or bases. NH₃ is a Brønsted-Lowry base. H₂O is a Brønsted-Lowry acid
To see why NH₃ is not an Arrhenius base, visit
You can learn how to identify Brønsted-Lowry acids an bases at
In your equation
NH₃ + H₂O → NH₄⁺ + OH⁻
The NH₃ has become NH₄⁺. It has one more H atom. It has accepted a proton (H⁺), so it is a Brønsted-Lowry base.
The H₂O has become OH⁻. It has one less H atom. It has donated a proton (H⁺), so it is a Brønsted-Lowry acid.
Hope this helps.